When Leung Jan, at age 73, retired back to his ancestral village Kulo Village, in Hokshen Province, he passed down a San Sik based Wing Chun Kuen System. There are two theories as to what this San Sik system is in relation to the standard Wing Chun Kuen that Leung Jan passed down to his Fatshan Student’s.

Theory 1) The Sup Yee San Sik is the distilation of Leung Jan’s 50 year’s of Wing Chun experience, coupled with his real time fighting experiance.He simplified and refined his system, as well as tried to speed up the Yik ging aspect of Wing Chun as found in his classmate, Fok Bo Chun’s art, as we see today in Yuen Kay Shan’s Lineage.

Theory 2) The San Sik were part of the original teaching’s, that he learned from Leung Yee Tai, which he refined during his many real time combat experiances against other Traditional Chinese Martial Arts.Dai Fa min kam was also known, like Leung Yee Tai, to have passed down a Wing Chun system, that was organized into a single hand form of Linked San Sik. These san sik were later broken down into literaly single movements, as supplimental training and were incorporated into many differant branchs of Wing Chun, as we can see to this day in Cheung Bo’s lineage, as well as Yuen Kay Shan’s teachings.